Robert m



UNITED sTATEs PATENT oEETcE.

WILLIAM M. BARTON, OF RUSSELLVILLE, TENNESSEE, ASSIGNOR TO WM. M. BARTONAND ROBERT M. BARTON.'

MACHIN `FOR DRILLING AND DRESSING STONE.

Specication of Letters Patent No. 15,591, datedAugust 19, 1856.

i To all whom 'it may concern:

Be it known that I, WILLIAM M. BARTON, of Russellville, in the county ofJeerson and State of Tennessee, have invented a new and usefulImprovement in Drilling and Dressing Stone, of which the following is afull, clear, and exact description, reference j being had to theaccompanying drawings,

representing myV improvement as applied to a hand churn-drill, ofwhich-Figure 1 is a View in perspective; Fig. 2, a side elevation, and Fig. 3is a longitudinal section at the lineas, in Fig. l.

In the accompanying drawing it will be seen, that instead of having `acumbrous frame to support the different parts of the drill, a simpleslab (A) is employed for that purpose, upon which, they are convenientlyand compactly arranged. Near the middle of the slab a recess is made toreceive a trans verse shaft (B) held in place by suitable boxes. One endofthis shaft projects beyond the edge of the slab, and has a crankhandle (C), attached to it, by which the drill is operated. V Betweenthis handle and the slab, this shaft (B) carries a cog wheel (D) whileits other end carries a bevel pinion (E), working in a recessin theslab. On the other side of the slab and directly opposite to the shaft(B) a crankshaft (F) is supported on two brackets (G), a pinion (H)being mounted on one end of said shaft (F) which matches with the cogwheel (D) on the shaft (B) and a fly wheel (I) on its opposite end. Thecrank shaft carries the connectingrod4 (J) which communicates the motionof the bell crank to the cutter or drill.

'Ihe drilling instrument is arranged on the same side of the slab asshaft (B), having its lower end square in its section and guided in thesquare eye of a wheel which eye permits the drill to rise and fallfreely, while the wheel (N) rotates it. The wheel (N) is supported in abracket (7c) projecting from the lower end of the slab. The drill at itshead is attached to the end of an arm (L) which projects through amortise (Z) made for that purpose in the slab, t-he opposite end of thearm being pivoted to a bracket A small but stiff recoil spring (T)situated immediately above the head of the drill stock (Q) so as to bepressed back by its rise, acts on its descent to increase the force ofthe blow.

From this it is plain that the turning of the handle (C) gives to thedrill a rotary motion simultaneously with the reciprocating motionalready mentioned. The gearing must be so proportioned as to establishthe desired relation between the frequency of the strokes and therevolutions of the drill.

From the foregoing it is clear that, were the connecting rod directlyand unyieldingly connected with the arm (L) the drill which if; carriedby said arm, must necessarily advance its full stroke at each revolutionof the crank shaft or the machine eitherl must be stopped or broken;consequently it is impossible in this manner to drill a hole, which canonly be accomplished by a successionvof unequal strokes, each advancingbeyond the other and penetrating to a gradually greater depth. Thereforeto remedy this and to obt-ain `all the advantages of a positive motion,I -connect the pitman to the arm (L) by means of a stiff spring (T)which will permit the crank and pitman to continue their motion at fullstroke when the drill and its arm are arrested. The spring is secured byone end near the pivot (U) of the arm, and by its other to the pitmanand forms the connection between the two.` The base of the drill is heldin place by an iron projection (V) which is pointed and eitherpenetrates the surface of th-e rock or is supported in any desired angle`by braces extending from its top and forming two legs of a tripodstandard while the slab forms the third leg.

It is obvious that under the arrangement .y of parts before described,the machine is made very compact and yet the drill has a lon range ofstroke with ample provision against breakage, and works steadily, theweight of the drill on one side of the slab or stock beingcounterbalanced by that of the vibrating (arm, connecting rod and theother, With the spring T and Vibrating 10 arm L to connect the saiddrill and Connecting rod, as herein set forth.

In testimony whereof, I have hereunto subscribed my name.

WILLIAM M. BARTON. vIn presence of- CLIsE RIGGS, RoLEN Gr. ESTES.

ora-nk, on the other; While on the other two opposite'sides, the WinchWith the gearing on the one, counterbalances the fly Wheel on the other.

Vhat I claim as my invention, and desire to secure by Letters Patent,is-

The arrangement herein described, of the drill Q on one side of the slabor stock A, and the crank F, and connecting-rod J on

